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2010-04-12T14:03:12+02:00
X+ 72=-27//_72
x=-99

x-5,4=-4,5//+5,4
x=0,9

x·2,5=100
2.5x=100//:2.5
x=40

x:3=3+1/2//*3
x=10+1/2

x·2+5=4x
2x+5=4x//-2x
5=2x//:2
2.5=x
2010-04-12T14:04:49+02:00
A) x = -27 - 72
x = -99
b)x = -4.5 + 5.4
x = 0.9
c)x· 2,5 = 100
2,5x = 100
x = 40
d) x:3= 3 1/2
x = 10 1/2 (10 całych i 1/2)
e) x· 2+5=4x
2x = 4x - 5
-2x = -5
x = 2.5
1 5 1